For some strange reason, nobody on my Bukkit server can break or place blocks or use blocks (crafting table, furnace) without me turning them into an operator. I believe this to the the biggest glitch that minecraft could have. It is very annoying to the players and after speaking to a few people, I have come to the conclusion that it is most likely a permissions error. I use PermissionsBukkit as well as Vault and WorldGuard. Some help would be appreciated.

They are on spawn, and spawn-protection in Bukkit.yml is already set to 0 (there isn't one in server.properties). It gets annoying when I'm hosting a skyblock server.
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Jeffrey LinJul 2 '12 at 1:48

@JeffreyLin Try disabling all the plugins and see if the problem persists, then re-enable them one at a time to figure out what the culprit is. Figuring out which plugin is causing the problem is a good start to figure out how to fix it
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Dave McClellandJul 2 '12 at 2:13